Venus' hairstone consists of this mineral with rutile ("ROO-tile") interspersed within. Citrine ("SIT- reen") is formed through heating the "smoky" form of this mineral, whose rarer forms consist of a "rose" form as well as amethyst. Sandstone is primarily composed of this mineral. Silicon dioxide is the primary composition of, for 10 points, what 
Venus' hairstone consists of this mineral with rutile ("ROO-tile") interspersed within. Citrine ("SIT- reen") is formed through heating the "smoky" form of this mineral, whose rarer forms consist of a "rose" form as well as amethyst. Sandstone is primarily composed of this mineral. Silicon dioxide is the primary composition of, for 10 points, what mineral, number 8 on the Mohs scale, which is used in glass and sandpaper?
Venus' hairstone consists of this mineral with rutile ("ROO-tile") interspersed within.
{quartz}